vieter-v
/
docker
2
0
Fork 0
Code Issues Pull Requests Releases Activity

Moved over code from Vieter

jef
Jef Roosens 2022-06-18 17:59:22 +02:00
commit 21db1050fa
Signed by: Jef Roosens
GPG Key ID: B75D4F293C7052DB
8 changed files with 532 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
.gitignore vendored 100644
View File

@ -0,0 +1 @@
*.so

3
README.md 100644
View File

@ -0,0 +1,3 @@
# Docker
V library for interacting with the Docker HTTP API.

123
containers.v 100644
View File

@ -0,0 +1,123 @@
module docker
import json
import net.urllib
import time
import net.http { Method }
struct DockerError {
message string
}
pub struct NewContainer {
image string [json: Image]
entrypoint []string [json: Entrypoint]
cmd []string [json: Cmd]
env []string [json: Env]
work_dir string [json: WorkingDir]
user string [json: User]
}
struct CreatedContainer {
pub:
id string [json: Id]
warnings []string [json: Warnings]
}
// create_container creates a new container with the given config.
pub fn (mut d DockerConn) create_container(c NewContainer) ?CreatedContainer {
d.send_request_with_json(Method.post, urllib.parse('/v1.41/containers/create')?, c)?
head, res := d.read_response()?
if head.status_code != 201 {
data := json.decode(DockerError, res)?
return error(data.message)
}
data := json.decode(CreatedContainer, res)?
return data
}
// start_container starts the container with the given id.
pub fn (mut d DockerConn) start_container(id string) ? {
d.send_request(Method.post, urllib.parse('/v1.41/containers/$id/start')?)?
head, body := d.read_response()?
if head.status_code != 204 {
data := json.decode(DockerError, body)?
return error(data.message)
}
}
struct ContainerInspect {
pub mut:
state ContainerState [json: State]
}
struct ContainerState {
pub:
running bool [json: Running]
status string [json: Status]
exit_code int [json: ExitCode]
// These use a rather specific format so they have to be parsed later
start_time_str string [json: StartedAt]
end_time_str string [json: FinishedAt]
pub mut:
start_time time.Time [skip]
end_time time.Time [skip]
}
// inspect_container returns detailed information for a given container.
pub fn (mut d DockerConn) inspect_container(id string) ?ContainerInspect {
d.send_request(Method.get, urllib.parse('/v1.41/containers/$id/json')?)?
head, body := d.read_response()?
if head.status_code != 200 {
data := json.decode(DockerError, body)?
return error(data.message)
}
mut data := json.decode(ContainerInspect, body)?
// The Docker engine API *should* always return UTC time.
data.state.start_time = time.parse_rfc3339(data.state.start_time_str)?
if data.state.status == 'exited' {
data.state.end_time = time.parse_rfc3339(data.state.end_time_str)?
}
return data
}
// remove_container removes the container with the given id.
pub fn (mut d DockerConn) remove_container(id string) ? {
d.send_request(Method.delete, urllib.parse('/v1.41/containers/$id')?)?
head, body := d.read_response()?
if head.status_code != 204 {
data := json.decode(DockerError, body)?
return error(data.message)
}
}
// get_container_logs returns a reader object allowing access to the
// container's logs.
pub fn (mut d DockerConn) get_container_logs(id string) ?&StreamFormatReader {
d.send_request(Method.get, urllib.parse('/v1.41/containers/$id/logs?stdout=true&stderr=true')?)?
head := d.read_response_head()?
if head.status_code != 200 {
content_length := head.header.get(http.CommonHeader.content_length)?.int()
body := d.read_response_body(content_length)?
data := json.decode(DockerError, body)?
return error(data.message)
}
return d.get_stream_format_reader()
}

137
docker.v 100644
View File

@ -0,0 +1,137 @@
module docker
import net.unix
import io
import net.http
import strings
import net.urllib
import json
import util
const (
socket = '/var/run/docker.sock'
buf_len = 10 * 1024
http_separator = [u8(`\r`), `\n`, `\r`, `\n`]
http_chunk_separator = [u8(`\r`), `\n`]
)
pub struct DockerConn {
mut:
socket &unix.StreamConn
reader &io.BufferedReader
}
// new_conn creates a new connection to the Docker daemon.
pub fn new_conn() ?&DockerConn {
s := unix.connect_stream(docker.socket)?
d := &DockerConn{
socket: s
reader: io.new_buffered_reader(reader: s)
}
return d
}
// close closes the underlying socket connection.
pub fn (mut d DockerConn) close() ? {
d.socket.close()?
}
// send_request sends an HTTP request without body.
pub fn (mut d DockerConn) send_request(method http.Method, url urllib.URL) ? {
req := '$method $url.request_uri() HTTP/1.1\nHost: localhost\n\n'
d.socket.write_string(req)?
// When starting a new request, the reader needs to be reset.
d.reader = io.new_buffered_reader(reader: d.socket)
}
// send_request_with_body sends an HTTP request with the given body.
pub fn (mut d DockerConn) send_request_with_body(method http.Method, url urllib.URL, content_type string, body string) ? {
req := '$method $url.request_uri() HTTP/1.1\nHost: localhost\nContent-Type: $content_type\nContent-Length: $body.len\n\n$body\n\n'
d.socket.write_string(req)?
// When starting a new request, the reader needs to be reset.
d.reader = io.new_buffered_reader(reader: d.socket)
}
// send_request_with_json<T> is a convenience wrapper around
// send_request_with_body that encodes the input as JSON.
pub fn (mut d DockerConn) send_request_with_json<T>(method http.Method, url urllib.URL, data &T) ? {
body := json.encode(data)
return d.send_request_with_body(method, url, 'application/json', body)
}
// read_response_head consumes the socket's contents until it encounters
// '\r\n\r\n', after which it parses the response as an HTTP response.
// Importantly, this function never consumes the reader past the HTTP
// separator, so the body can be read fully later on.
pub fn (mut d DockerConn) read_response_head() ?http.Response {
mut res := []u8{}
util.read_until_separator(mut d.reader, mut res, docker.http_separator)?
return http.parse_response(res.bytestr())
}
// read_response_body reads `length` bytes from the stream. It can be used when
// the response encoding isn't chunked to fully read it.
pub fn (mut d DockerConn) read_response_body(length int) ?string {
if length == 0 {
return ''
}
mut buf := []u8{len: docker.buf_len}
mut c := 0
mut builder := strings.new_builder(docker.buf_len)
for builder.len < length {
c = d.reader.read(mut buf) or { break }
builder.write(buf[..c])?
}
return builder.str()
}
// read_response is a convenience function which always consumes the entire
// response & returns it. It should only be used when we're certain that the
// result isn't too large.
pub fn (mut d DockerConn) read_response() ?(http.Response, string) {
head := d.read_response_head()?
if head.header.get(http.CommonHeader.transfer_encoding) or { '' } == 'chunked' {
mut builder := strings.new_builder(1024)
mut body := d.get_chunked_response_reader()
util.reader_to_writer(mut body, mut builder)?
return head, builder.str()
}
content_length := head.header.get(http.CommonHeader.content_length)?.int()
res := d.read_response_body(content_length)?
return head, res
}
// get_chunked_response_reader returns a ChunkedResponseReader using the socket
// as reader.
pub fn (mut d DockerConn) get_chunked_response_reader() &ChunkedResponseReader {
r := new_chunked_response_reader(d.reader)
return r
}
// get_stream_format_reader returns a StreamFormatReader using the socket as
// reader.
pub fn (mut d DockerConn) get_stream_format_reader() &StreamFormatReader {
r := new_chunked_response_reader(d.reader)
r2 := new_stream_format_reader(r)
return r2
}

61
images.v 100644
View File

@ -0,0 +1,61 @@
module docker
import net.http { Method }
import net.urllib
import json
struct Image {
pub:
id string [json: Id]
}
// pull_image pulls the given image:tag.
pub fn (mut d DockerConn) pull_image(image string, tag string) ? {
d.send_request(Method.post, urllib.parse('/v1.41/images/create?fromImage=$image&tag=$tag')?)?
head := d.read_response_head()?
if head.status_code != 200 {
content_length := head.header.get(http.CommonHeader.content_length)?.int()
body := d.read_response_body(content_length)?
data := json.decode(DockerError, body)?
return error(data.message)
}
// Keep reading the body until the pull has completed
mut body := d.get_chunked_response_reader()
mut buf := []u8{len: 1024}
for {
body.read(mut buf) or { break }
}
}
// create_image_from_container creates a new image from a container.
pub fn (mut d DockerConn) create_image_from_container(id string, repo string, tag string) ?Image {
d.send_request(Method.post, urllib.parse('/v1.41/commit?container=$id&repo=$repo&tag=$tag')?)?
head, body := d.read_response()?
if head.status_code != 201 {
data := json.decode(DockerError, body)?
return error(data.message)
}
data := json.decode(Image, body)?
return data
}
// remove_image removes the image with the given id.
pub fn (mut d DockerConn) remove_image(id string) ? {
d.send_request(Method.delete, urllib.parse('/v1.41/images/$id')?)?
head, body := d.read_response()?
if head.status_code != 200 {
data := json.decode(DockerError, body)?
return error(data.message)
}
}

135
stream.v 100644
View File

@ -0,0 +1,135 @@
module docker
import io
import util
import encoding.binary
import encoding.hex
// ChunkedResponseReader parses an underlying HTTP chunked response, exposing
// it as if it was a continuous stream of data.
struct ChunkedResponseReader {
mut:
reader io.BufferedReader
bytes_left_in_chunk u64
started bool
}
// new_chunked_response_reader creates a new ChunkedResponseReader on the heap
// with the provided reader.
pub fn new_chunked_response_reader(reader io.BufferedReader) &ChunkedResponseReader {
r := &ChunkedResponseReader{
reader: reader
}
return r
}
// read satisfies the io.Reader interface.
pub fn (mut r ChunkedResponseReader) read(mut buf []u8) ?int {
if r.bytes_left_in_chunk == 0 {
// An io.BufferedReader always returns none if its stream has
// ended.
r.bytes_left_in_chunk = r.read_chunk_size()?
}
mut c := 0
// Make sure we don't read more than we can safely read. This is to avoid
// the underlying reader from becoming out of sync with our parsing:
if buf.len > r.bytes_left_in_chunk {
c = r.reader.read(mut buf[..r.bytes_left_in_chunk])?
} else {
c = r.reader.read(mut buf)?
}
r.bytes_left_in_chunk -= u64(c)
return c
}
// read_chunk_size advances the reader & reads the size of the next HTTP chunk.
// This function should only be called if the previous chunk has been
// completely consumed.
fn (mut r ChunkedResponseReader) read_chunk_size() ?u64 {
if r.started {
mut buf := []u8{len: 2}
// Each chunk ends with a `\r\n` which we want to skip first
r.reader.read(mut buf)?
}
r.started = true
mut res := []u8{}
util.read_until_separator(mut r.reader, mut res, http_chunk_separator)?
// The length of the next chunk is provided as a hexadecimal
mut num_data := hex.decode(res#[..-2].bytestr())?
for num_data.len < 8 {
num_data.insert(0, 0)
}
num := binary.big_endian_u64(num_data)
// This only occurs for the very last chunk, which always reports a size of
// 0.
if num == 0 {
return none
}
return num
}
// StreamFormatReader parses an underlying stream of Docker logs, removing the
// header bytes.
struct StreamFormatReader {
mut:
reader ChunkedResponseReader
bytes_left_in_chunk u32
}
// new_stream_format_reader creates a new StreamFormatReader using the given
// reader.
pub fn new_stream_format_reader(reader ChunkedResponseReader) &StreamFormatReader {
r := &StreamFormatReader{
reader: reader
}
return r
}
// read satisfies the io.Reader interface.
pub fn (mut r StreamFormatReader) read(mut buf []u8) ?int {
if r.bytes_left_in_chunk == 0 {
r.bytes_left_in_chunk = r.read_chunk_size()?
}
mut c := 0
if buf.len > r.bytes_left_in_chunk {
c = r.reader.read(mut buf[..r.bytes_left_in_chunk])?
} else {
c = r.reader.read(mut buf)?
}
r.bytes_left_in_chunk -= u32(c)
return c
}
// read_chunk_size advances the reader & reads the header bytes for the length
// of the next chunk.
fn (mut r StreamFormatReader) read_chunk_size() ?u32 {
mut buf := []u8{len: 8}
r.reader.read(mut buf)?
num := binary.big_endian_u32(buf[4..])
if num == 0 {
return none
}
return num
}

65
util/util.v 100644
View File

@ -0,0 +1,65 @@
module util
import io
// reader_to_writer tries to consume the entire reader & write it to the writer.
pub fn reader_to_writer(mut reader io.Reader, mut writer io.Writer) ? {
mut buf := []u8{len: 10 * 1024}
for {
bytes_read := reader.read(mut buf) or { break }
mut bytes_written := 0
for bytes_written < bytes_read {
c := writer.write(buf[bytes_written..bytes_read]) or { break }
bytes_written += c
}
}
}
// match_array_in_array<T> returns how many elements of a2 overlap with a1. For
// example, if a1 = "abcd" & a2 = "cd", the result will be 2. If the match is
// not at the end of a1, the result is 0.
pub fn match_array_in_array<T>(a1 []T, a2 []T) int {
mut i := 0
mut match_len := 0
for i + match_len < a1.len {
if a1[i + match_len] == a2[match_len] {
match_len += 1
} else {
i += match_len + 1
match_len = 0
}
}
return match_len
}
// read_until_separator consumes an io.Reader until it encounters some
// separator array. The data read is stored inside the provided res array.
pub fn read_until_separator(mut reader io.Reader, mut res []u8, sep []u8) ? {
mut buf := []u8{len: sep.len}
for {
c := reader.read(mut buf)?
res << buf[..c]
match_len := match_array_in_array(buf[..c], sep)
if match_len == sep.len {
break
}
if match_len > 0 {
match_left := sep.len - match_len
c2 := reader.read(mut buf[..match_left])?
res << buf[..c2]
if buf[..c2] == sep[match_len..] {
break
}
}
}
}

7
v.mod 100644
View File

@ -0,0 +1,7 @@
Module {
name: 'vdocker'
description: 'Library for interacting with the Docker HTTP API'
version: '0.0.0'
license: 'MIT'
dependencies: []
}